what casues leaves to change color in autam
Answers
Answer: Chlorophyll Breaking down.
Explanation: When it starts to get cooler the chlorophyll breaks down causing the pretty green color to change to brown gold and orange.
Related Questions
Fill in the information below using the knowledge you just learned of the periodic table.
1. What is the name of this element?
2. What is the atomic number of this element?
3. What is the atomic mass of this element?
4. What is the symbol for this element?
Answers
2. 24
3. 51.996
4. Cr
The distance from one crest to the next is the ________.
Answers
Answer:
Wavelength.
Explanation:
1 period, or wavelength, is measured from one crest to another or from one trough to another.
A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the same volume. What is
the most likely difference between the two samples?
The nonmetal has more mass.
O The nonmetal takes up more space.
O The metal has more mass.
O The metal takes up more space.
Plzzz help !!!
Answers
Answer:
Ok I’m not pretty sure but I think it’s C but look for more answers first before you put C because I don’t want you to get it wrong. :)
Explanation:
Answer:
i think the answer is The nonmetal takes up more space.
Explanation:
i hope this helps
Identify the type of friction in each situation described below:
a. Two students are pushing a box that is at rest
b. The box pushed by the students is now sliding
c. The students put rollers under the box and push it forward
Answers
Answer:
A . static frictional force
B. kinectic friction
C.. Rolling friction
A plan traveled 3000 km north in 2.5 hours? What is the velocity of the plane?
Answers
In 2.5 hours, a plan covered 3000 miles in the north. The plane is moving at a 1200 km/ hr speed.
What formula is employed?Distance = speed time is the formula used to solve the distance problem.
What exactly is meant by velocity?It measures how far an object travels in a certain amount of time.. Velocity is defined as the distance an object travels in one unit of time.
Given,
2 and a half hours
1200 kilometer.
Distance/Time = Velocity
= 3000/2.5
= 1200km/ hr
How can I determine the velocity?By dividing the amount of time it took the object to go a certain distance by the overall distance, one can calculate the object's initial velocity. V is the velocity, d is the distance, and t is the time in the equation V = d/t.
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glider 1 glider 2 v(approach) v(separation) mass velocity mass velocity m (kg) v (m/s) m (kg) v (m/s) before collision after collision before collision after collision
Answers
The velocities of the gliders after the collision depend on the masses and velocities of the gliders before the collision, as well as the type of collision. We can solve the equations based on the conservation of momentum and kinetic energy to find the velocities of the gliders after the collision.
Assuming the gliders are initially moving toward each other, let's call them Glider 1 and Glider 2. Glider 1 has a mass of m1 and is moving towards Glider 2 with velocity v1, while Glider 2 has a mass of m2 and is moving towards Glider 1 with velocity v2.
The approach velocity (v_approach) is the sum of the velocities of Glider 1 and Glider 2, which is \(v_{approach} = v_1 + v_2\). The separation velocity (v_separation) is the difference between their velocities, which is \(v_{separation} = v_1 - v_2\).
When the two gliders collide, they will experience a change in momentum, which is equal to the mass times the change in velocity (Δp = mΔv). The law of conservation of momentum states that the total momentum of a system before a collision is equal to the total momentum after the collision, provided there are no external forces acting on the system.
Therefore, we can set up two equations based on the conservation of momentum:
\($m_{1}v_{1} + m_{2}v_{2} = m_{1}v_{1}' + m_{2}v_{2}'$\) (total momentum before collision = total momentum after collision)
\($m_{1}v_{1} + m_{2}v_{2} = (m_{1} + m_{2})v_{\mathrm{cm}}$\) (v_cm is the velocity of the center of mass of the system)
We can also use the fact that the kinetic energy of the system is conserved if the collision is elastic. In an elastic collision, both momentum and kinetic energy are conserved.
Therefore, we can set up another equation based on the conservation of kinetic energy:
\($\frac{1}{2}m_{1}v_{1}^{2} + \frac{1}{2}m_{2}v_{2}^{2} = \frac{1}{2}m_{1}v_{1}'^{2} + \frac{1}{2}m_{2}v_{2}'^{2}$\)
We can solve these equations to find the velocities of the gliders after the collision. However, we need more information about the collision to get exact values. If the collision is perfectly elastic, then we can assume that the kinetic energy is conserved and solve for the velocities. If the collision is inelastic, then some of the kinetic energy will be lost as heat or sound, and the velocities of the gliders after the collision will be lower than in the elastic case.
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The American bullfrog (Rana catesbeiana) can jump a distance of
nearly 15 times its length! If a bullfrog starts on a horizontal log and
leaps with a velocity of 4.40 m/s at an angle of 37.0° to the horizontal,
what distance can it cover?
Answers
Answer:
Approximately \(1.90\; {\rm m}\) (assuming that \(g = 9.81\; {\rm m\cdot s^{-2}}\) and that air resistance on the bullfrog is negligible.)
Explanation:
It is given that the initial velocity \(u\) is at an angle of \(\theta = 37.0^{\circ}}\) above the horizontal. Therefore:
Initial vertical velocity: \(u_{y} = u\, \sin(\theta) \approx 2.64799\; {\rm m \cdot s^{-1}}\).Initial horizontal velocity: \(u_{x} = u\, \cos(\theta) \approx 3.51400\; {\rm m \cdot s^{-1}}\).
If air resistance on the bullfrog is negligible, final vertical velocity right before landing will be the opposite of the initial vertical velocity:
\(v_{y} = (-u_{y}) = (-2.64799)\; {\rm m\cdot s^{-1}}\).
Change in vertical velocity:
\((v_{y} - u_{y}) = (-2.64799) \; {\rm m\cdot s^{-1}} - 2.64799 \; {\rm m\cdot s^{-1}} \approx (-5.29598)\; {\rm m\cdot s^{-1}}\).
Vertical acceleration of the bullfrog will be \(a = (-g) = (-9.81)\; {\rm m\cdot s^{-2}}\) while the frog is in the air. Therefore, time required for the velocity to change will be:
\(\begin{aligned} t &= \frac{v_{y} - u_{y}}{a_{y}} \\ &= \frac{v_{y} - u_{y}}{(-g)} \\ &\approx \frac{(-5.29598)\; {\rm m\cdot s^{-1}}}{(-9.81)\; {\rm m\cdot s^{-2}}} \\ &\approx 0.53985\; {\rm s}\end{aligned}\).
If air resistance on the bullfrog is negligible, horizontal velocity will be constant: \(v_{x} = u_{x} \approx 3.51400\; {\rm m\cdot s^{-2}}\). After \(t \approx 0.53985\; {\rm s}\) in the air, the horizontal displacement of the bullfrog will be:
\(\begin{aligned}x_{x} &= v_{x}\, t \\ &\approx 3.51400\; {\rm m\cdot s^{-1}} \times 0.53985\; {\rm s} \\ &\approx 1.90\; {\rm m} \end{aligned}\).
Therefore, this bullfrog will cover a distance of approximately \(1.90\; {\rm m}\).
What happened to the kelp forest when the otter was hunted to near extinction?
Answers
Answer: Sea otter is the pioneer species in the kelp forest as it regulates and controls the population of other species in the kelp forest.
Explanation:
If sea otters are hunted and their population is brought to extinction then this will cause major harm the ecosystem of the kelp forest and it will disturb the ecological balance in the kelp forest. The herbivorous animals consumed by the sea otters will increase in population and they will consume a lot of vegetation in the forest. The kelp forest which forms the coastline will not remain effective in providing protection against the storms to the neighboring areas.
19. Jorge was driving at 20m/s. He accelerated at a rate of 2m/s² for 10s. How far did he travel during this time?
Answers
Jorge was driving at 20m/s. He accelerated at a rate of 2m/s² for 10s.
So he travel ---m during this time.
Jorge was driving at 20m/s, so speed = 20 units
He accelerated at a rate of 2m/s² so acceleration = 2 units
Time taken by Jorge is 10 units.
We know by Newton's 2nd equation of motion that
S= ut + (1/2)*a*t*t
where S is distance, a is acceleration, u is initial velocity and t is time.
So S=?
Time t = 10
Acceleration a =2
Initial Velocity u = 20
Hence distance travelled by Jorge is S=300 m
Thus Jorge travelled 300m during this time at speed 20m/s accelerated at a rate of 2m/s² for 10s.
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an airplane wing modeled as a spring-mass system with natural frequency 50 hz is driven harmonically by the rotation of its engines at 49.8 hz. calculate the period of the resulting beat.
Answers
The period of the resulting beat can be calculated by finding the difference between the natural frequency and the driving frequency. In this case, the period of the resulting beat is 0.02 seconds.
The natural frequency of the airplane wing modeled as a spring-mass system is given as 50 Hz, while the frequency of rotation of the engines is given as 49.8 Hz. The difference between these two frequencies is 0.2 Hz.
Since the period is the reciprocal of frequency, we can calculate the period of the resulting beat by taking the inverse of the frequency difference: 1/0.2 = 5 seconds.
However, the resulting beat is the time it takes for the two frequencies to repeat their phase relationship, so we divide the period by 2, resulting in a period of 0.02 seconds. Therefore, the period of the resulting beat is 0.02 seconds.
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0.520 R
1.500 R
&
0.520 R
·+-
1.300
Determine length x for the gage in the accompanying figure. Assume y = 0.350 inches and give your answer to
the nearest hundredth of an inch.
Answers
The length of the rectangle is x ≈ 2.72 inches, to the nearest hundredth of an inch.
We can approach this problem using the Pythagorean theorem and some basic geometry.
We are given that the radius of the semicircle is 1.5 inches and the radius of the chamfering is 0.52 inches. Let's call the height of the rectangle h, the length of the rectangle x, and the thickness of the rectangle y. Then we have:
h + 1.5 + 0.52 = 1.3
Solving for h, we get:
h = 1.3 - 1.5 - 0.52 = -0.72
This doesn't make sense, since the height of the object should be positive. Therefore, there must be an error in the problem statement. Perhaps the height of the rectangle is actually y instead of h?
Assuming that the height of the rectangle is y, we have:
y + h + 1.5 + 0.52 = 1.3
Solving for h, we get:
h = 1.3 - y - 1.5 - 0.52
Now, let's use the Pythagorean theorem to find x. We can draw a right triangle with one leg equal to y and the other leg equal to x/2 + 1.5 + 0.52. The hypotenuse of the triangle is equal to the diameter of the semicircle, which is 3 inches. Therefore, we have:
y^2 + (x/2 + 1.5 + 0.52)^2 = 3^2
Simplifying this equation, we get:
y^2 + x^2/4 + x + 3.04y + 3.04 = 9
Multiplying both sides by 4, we get:
4y^2 + x^2 + 4x + 12.16y + 12.16 = 36
Simplifying again, we get:
x^2 + 4x + 4y^2 + 12.16y - 23.84 = 0
This is a quadratic equation in x. We can solve it using the quadratic formula:
x = (-4 ± sqrt(4^2 - 4(4y^2 + 12.16y - 23.84))) / 2
Simplifying, we get:
x = (-2 ± sqrt(16 - 4(4y^2 + 12.16y - 23.84))) / 2
x = (-2 ± sqrt(4y^2 + 12.16y - 7.84)) / 2
We want to find x to the nearest hundredth of inches. Let's plug in y = 0.35 and use a calculator to solve for x:
x = (-2 ± sqrt(4(0.35)^2 + 12.16(0.35) - 7.84)) / 2
x ≈ 2.72 or x ≈ -6.72
We reject the negative solution since x is a length, so it must be positive.
Therefore, the length of the rectangle is x ≈ 2.72 inches, to the nearest hundredth of an inch.
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which is part of the process in the formation of hail pellets? they are tossed up and down in clouds. they lose layers of ice and grow smaller. they grow to less than 5 mm in diameter. they form ice crystals directly from wate
Answers
The process involved in the formation of hail pellets includes the formation of ice crystals directly from water. These ice crystals are tossed up and down in clouds, where they grow by accumulating layers of ice. Typically, hail pellets can grow to more than 5 mm in diameter.
One part of the process in the formation of hail pellets is that they grow to less than 5 mm in diameter as they are tossed up and down in clouds.
As they continue to grow, they lose layers of ice and may become smaller. However, it's important to note that hail pellets do not form ice crystals directly from water, as they require supercooled water droplets to form.
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The amount of lateral strain in a tension member can be calculated using OA the coeficient of expansion B the moment of inertia OCthe yield stress OD Poisson's rati
Answers
The amount of lateral strain in a tension member can be calculated using Poisson's ratio.
To calculate the lateral strain, we can use the equation: ε_lateral = -ν * ε_longitudinal
Where:
ε_lateral = Lateral strain
ν = Poisson's ratio
ε_longitudinal = Longitudinal strain
Poisson's ratio (ν) is a material property that describes the ratio of lateral strain to longitudinal strain when a material is subjected to an axial load. It is defined as the negative ratio of the transverse strain to the longitudinal strain.
Calculating the lateral strain involves determining the longitudinal strain, which can be calculated using the equation:ε_longitudinal = ΔL / L
Where:
ε_longitudinal = Longitudinal strain
ΔL = Change in length of the tension member
L = Original length of the tension member
Once the longitudinal strain is calculated, we can use Poisson's ratio to determine the lateral strain by multiplying the longitudinal strain by the negative value of Poisson's ratio.
It is important to note that the lateral strain is typically very small compared to the longitudinal strain in a tension member, especially for materials with a low Poisson's ratio.
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If a cube of 1 mm side is divided into 1 nm-sized cubes, the total surface area will increase by a factor of:
a. 10^6>
b. 2 x 10^6
c. 6 x 10^6
d. 6 x 10^12
Answers
If a cube of 1 mm side is divided into 1 nm-sized cubes, the total surface area will increase by a factor of 6 x 10⁶, hence C is correct option.
Each face of the original cube has an area of (1 mm)² = 10⁶ nm². When we divide the cube into smaller cubes of 1 nm on each side, we increase the number of faces by a factor of (1 nm / 1 mm)² = 10⁻⁶, since each small cube has six faces. Therefore, the total surface area of the small cubes is:
= 6 x (10⁶ nm²) x (10⁶ x 10⁻⁶)
= 6 x 10⁶ nm².
This is an increase in the total surface area by a factor of 6 x 10⁶.
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Types of Reactions Quick CheckIn a chemical reaction, substance A transfers electrons to substance B. Which statement is correct?(1 point)Substance A is oxidized and acts as the oxidizing agent.Substance B is oxidized and acts as the reducing agent.Substance B is reduced and acts as the oxidizing agent.Substance A is reduced and acts as the reducing agent.
Answers
Answer:
1. Which statement correctly describes the classification of chemical reactions into different categories?
-Not all reactions fit into a category, and some reactions can fit into more than one category.
2. In a synthesis reaction, two atoms of sodium (Na) combine with one molecule of chlorine gas (Cl2) to produce sodium chloride (NaCl). How many molecules of sodium chloride are produced?
-Two
3. In the decomposition of water, why is twice as much hydrogen as oxygen formed?
- There are two atoms of hydrogen and one atom of oxygen in a water molecule.
4. Which component is transferred between substances in an oxygen-reduction reaction?
-Electrons
5. In a chemical reaction, substance A transfers electrons to substance B. Which statement is correct?
-Substance B is reduced and acts as the oxidizing agent.
Hope that helps!!
Substance B is reduced and acts as the oxidizing agent.
REDOX REACTION:
A redox reaction is also called an oxidation-reduction reaction because it involves the transfer and receipt of electrons by compounds or molecules. Oxidation-reduction reaction happens when the oxidation number of the ions involved in the reaction changes. The substance that transfers or loses electrons in a redox reaction is called the REDUCING AGENT while the substance that gains or accepts electrons is called OXIDIZING AGENT. The reducing agent becomes oxidized because it loses electrons while the oxidizing agent becomes reduced because it gains electrons. Therefore, if substance A transfers electrons to substance B, the correct statement is that "Substance B is reduced and acts as the oxidizing agent".Learn more: https://brainly.com/question/10547418?referrer=searchResults
What happens when a light wave is refracted?
The waves spread out.
The wave changes direction.
The wave is scattered.
The wave changes frequency.
Answers
Given what we know, we can confirm that when a light wave is refracted, it changes direction.
What is refraction?Refraction is a term used to explain and describe the change in direction of a light wave as it passes through a medium. This change in direction is caused by the change in speed of the light wave entering a new medium.
Therefore, we can confirm that when a light wave is refracted, it changes direction.
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rustic ramblings furniture company manufactures furniture. rustic ramblings uses a job order cost system. balances on august 1 from the materials ledger are as follows: fabric $3,750
Answers
Process costing and job-order costing are two instances of costing systems.
What is Job-order costing?Companies will select a costing system that is suitable for the type of manufactured items. Process costing and job-order costing are two instances of costing systems. the products being created are customized and each one has individual manufacturing requirements, job-order costing is applied. If the manufactured goods are uniform and have identical manufacturing needs, process costing is applied. All manufacturing expenses are tracked on a job-cost sheet in a job-order costing system. These expenses consist of direct material, direct labor, and overhead for manufacture.Since these expenses may be linked to a specific product, actual direct costs for materials and labor will typically be used. However, because actual overhead costs won't be accessible until the end of the period, applied.April 1 DR Raw Material - Fabric 338,400
DR Raw Material - Polyester filling 470,400
DR Raw Material - Lumber 902,400
DR Raw Material - Glue 32,400
CR Accounts Payable 1,743,600
April 3 DR Work in Process 1,726,400
CR Raw Material - Fabric 315,800
CR Raw Material - Polyester filling 424,400
CR Raw Material - Lumber 986,200
April 3 DR Manufacturing Overhead 34,800
CR Raw Material - Glue 34,800
April 30 Balances in Raw Materials Accounts:
Fabric: 67,500 + 338,400 - 315,800 = $90,100
Polyester filling: 20,200 + 470,400 - 424,400 = $66,200
Lumber: 150,000 + 902,400 - 986,200 = $66,200
Glue: 6,550 + 32,400 - 34,800 = $4,150
The complete question is,
Eclectic Ergonomics Company manufactures designer furniture. Eclectic Ergonomics uses a job order cost system Balances on April 1 from the materials ledger are as follows:
Fabric $67,500
Polyester filling 20, 200
Lumber 150,000
Glue 6,550
The materials purchased during April are summarized from the receiving reports as follows:
Fabric $338,400
Polyester filling 470,400
Lumber 902,400
Glue 32,400
Materials were requisitioned to individual jobs as follows:
Fabric Polyester Filling Lumber Glue Total
Job 81 $127,400 $160,800 $401,200 $689,400
Job 82 97,200 145,200 375,000 617,400
Job 83 91,200 118,400 210,000 419,600
Factory overhead-indirect materials $34,800 34,800
Total $315,800 $424,400 $986,200 $34,800 $1,761,200
The glue is not a significant cost, so it is treated as indirect materials (factory overhead).
Required:
a. Journalize the April 1 entry to record the purchase of materials in April.*
b. Journalize the April 3 entry to record the requisition of materials in April.*
c. Determine the April 30 balances that would be shown in the materials ledger accounts.
∗Refer to the Chart of Accounts for exact wording of account titles.
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Two examples of costing systems are workflow costing and job-order costing.
How much does a job order cost?Companies will choose a costing system based on the nature of the manufactured goods. Two examples of costing systems are process accounting and job-order costing.
Job-order costing is used because the products being made are bespoke and have unique manufacturing needs. Process costing is used when the consumer products are homogeneous and have equal manufacturing requirements.
Actual direct costs on both labor and materials will often be used because these prices could be related to a particular product. However, since the availability of actual overhead expenses won't be until the conclusion of the term, applied.
Briefing:
April 1 DR Raw Material - Fabric 338,400
DR Raw Material - Polyester filling 470,400
DR Raw Material - Lumber 902,400
DR Raw Material - Glue 32,400
CR Accounts Payable 1,743,600
April 3 DR Work in Process 1,726,400
CR Raw Material - Fabric 315,800
CR Raw Material - Polyester filling 424,400
CR Raw Material - Lumber 986,200
April 3 DR Manufacturing Overhead 34,800
CR Raw Material - Glue 34,800
April 30 Balances in Raw Materials Accounts:
Fabric: 67,500 + 338,400 - 315,800 = $90,100
Polyester filling: 20,200 + 470,400 - 424,400 = $66,200
Lumber: 150,000 + 902,400 - 986,200 = $66,200
Glue: 6,550 + 32,400 - 34,800 = $4,150
The complete question is,
Eclectic Ergonomics Company manufactures designer furniture. Eclectic Ergonomics uses a job order cost system Balances on April 1 from the materials ledger are as follows:
Fabric $67,500
Polyester filling 20, 200
Lumber 150,000
Glue 6,550
The materials purchased during April are summarized from the receiving reports as follows:
Fabric $338,400
Polyester filling 470,400
Lumber 902,400
Glue 32,400
Materials were requisitioned to individual jobs as follows:
Fabric Polyester Filling Lumber Glue Total
Job 81 $127,400 $160,800 $401,200 $689,400
Job 82 97,200 145,200 375,000 617,400
Job 83 91,200 118,400 210,000 419,600
Factory overhead-indirect materials $34,800 34,800
Total $315,800 $424,400 $986,200 $34,800 $1,761,200
The glue is not a significant cost, so it is treated as indirect materials (factory overhead).
Required:
a. Journalize the April 1 entry to record the purchase of materials in April.*
b. Journalize the April 3 entry to record the requisition of materials in April.*
c. Determine the April 30 balances that would be shown in the materials ledger accounts.
∗Refer to the Chart of Accounts for exact wording of account titles.
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The wave above has a wavelength of 6.25 meters and a frequency of 5 hertz. Calculate the speed.
Answers
Answer:
Wave Speed (m/s)
31.25
Summary
Wavelength (m)6.25
Frequency (hz)5
Explanation:
https://calculator.academy/wave-speed-calculator/#f1p1
Which phrase describes scientific law
Answers
A scientific law is an established principle that explains a phenomenon or behavior in the natural world. It is a concise statement that summarizes the results of many observations and experiments and is widely accepted as true because it has been confirmed over and over again.
Scientific laws do not explain why something happens, but rather they describe how something behaves under certain conditions. They provide a basis for predicting how things will behave in the future based on past experience. Scientific laws can be expressed mathematically, but not all scientific laws are mathematical equations. Some examples of scientific laws are the laws of thermodynamics, Newton's laws of motion, and the law of gravity. The law of gravity, for example, states that any two objects in the universe attract each other with a force that is proportional to their masses and inversely proportional to the square of the distance between them. This law has been confirmed countless times through observations and experiments, and it has become a fundamental principle of physics. Scientific laws are not the same as scientific theories, which are explanations for why something happens. Theories are more complex and have not been confirmed as thoroughly as scientific laws. However, scientific laws and theories work together to form the basis of scientific understanding of the natural world.For such more question on Newton's laws of motion
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use the nebular theory to explain why the planets revolve around the sun in the same direction
Answers
We can use the nebular theory to explain why the planets revolve around the Sun in the same direction, and it is because they inherited the same direction of rotation from the spinning protoplanetary disk during their formation.
The Nebular Theory is a theory about the formation of the Solar System. It proposes that our Solar System formed from a giant cloud of interstellar gas and dust called a nebula. This nebula eventually collapsed due to gravity, and it started to spin. As the nebula spun faster and faster, it flattened out into a disk-like structure called a protoplanetary disk.
Over time, small particles in the disk started to stick together and form larger and larger objects called planetesimals. These planetesimals then collided with each other and merged to form the planets that we see today.
The reason why the planets revolve around the Sun in the same direction is due to the conservation of angular momentum. Angular momentum is a measure of how much an object is rotating or spinning. According to the conservation of angular momentum, the total amount of angular momentum in a system remains constant unless an external torque acts on the system.
In the case of the Solar System, the protoplanetary disk was spinning in a particular direction. As the planets formed from this disk, they inherited the same direction of rotation. This is why all the planets in our Solar System orbit the Sun in the same direction.
Therefore, we can use the nebular theory to explain why the planets revolve around the Sun in the same direction, and it is because they inherited the same direction of rotation from the spinning protoplanetary disk during their formation.
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Solve the science problem
Answers
What is the meaning of magnitude in physics?
Answers
In physics, magnitude refers to the size or strength of a physical quantity, such as a force, velocity, or acceleration. It is a scalar quantity, which means it has only a numerical value and no direction.
For example, the magnitude of velocity is a measure of how fast an object is moving, regardless of the direction it is moving in. Similarly, the magnitude of force is a measure of how strong a force is, regardless of the direction in which it is applied.
In physics, many physical quantities are vector quantities, meaning they have both a magnitude and a direction. For example, velocity and acceleration are vector quantities because they have both a magnitude (speed) and a direction (north, south, east, west, etc.).
When working with vector quantities, it is important to understand both the magnitude and direction, as they both affect the outcome of a problem.
In astronomy, magnitude is a measure of the brightness of a celestial object, often used to describe stars, galaxies, and other celestial bodies. It is measured in a logarithmic scale and the lower the magnitude, the brighter the object is.
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An iron is supplied with a current of 3 A from the mains. The resistance of the iron is 1000
Calculate the power of the iron.
Answers
Answer:
1.6 An iron is supplied with a current of 3 A from the mains. The resistance of the iron is 100 Ω. Calculate the power of the iron. [2
Which choices are all PHYSICAL properties? choose all that apply
a. Shape
b. Density
c. Conductivity
d, Color
e.Flammability
Answers
Answer:
Shape
Density
color
Explanation:
Refer to photo , there are seven questions .
Answers
2. At t = 30s, the average speed is 20 km.
3. The acceleration between 20s and 30s is 8 km.
4. At t = 40s, the average speed is 30 km.
5. At t = 60s, the average speed is 56 km.
6. The acceleration between 40s and 60s is 26 km.
7. The object is not accelerating at a constant rate.
A 2011 Porsche 911 Turbo S goes from 0-27 m/s in 2.7 seconds. What is the
car's acceleration?
Answers
0 to 60 mph in 4.5 seconds
Explanation:
An object is placed 2.0 m away from a convex mirror of focal length -1.0m. The image formed by the mirror is ___
a. real and larger than the object.
b. real and smaller than the object.
c. real and the same size as the object. d. virtual and larger than the object. e. virtual and smaller than the object
Answers
The image formed by the mirror is virtual and smaller than the object.
So, the answer is e.
When an object is placed 2.0m away from a convex mirror with a focal length of -1.0m, the image formed by the mirror can be determined using the mirror equation: 1/f = 1/do + 1/di.
Here, f is the focal length of the mirror, do is the object distance, and di is the image distance. Plugging in the given values, we get 1/-1.0 = 1/2.0 + 1/di. Solving for di, we get di = -0.67m.
Since the image distance is negative, the image is virtual. Also, since the object distance is greater than the focal length, the image is smaller than the object.
Therefore, the correct answer is e. virtual and smaller than the object.
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an aluminum flagpole is 39.4 m high. by how much does its length increase as the temperature increases by 15
Answers
The length of the aluminum flagpole will increase by 0.00881 m as the temperature increases by 15.
The length of an aluminum flagpole may not change with temperature. While thermal expansion can cause materials to change in size when heated or cooled, aluminium, as a metal, is not significantly affected by temperature changes. As such, the length of an aluminium flagpole is unlikely to be significantly affected by changes in temperature.
Calculate the Coefficient of Linear Expansion for Aluminum
The coefficient of Linear Expansion for aluminum is about 0.000023 per degree Celsius
Calculate the change in length
Change in length = (Coefficient of Linear Expansion x Original Length x Change in Temperature)
Change in length = (0.000023 x 39.4 m x 15) = 0.00881 m
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Which quotations addresses the audience concern that
president obama should not take anymore actions at the end of
his term while he is waiting for president trump to take office?
select one:
"over the last eight years, we've delivered on that promise in many
ways, both big and small, including, of course, providing health
coverage to 20 million more americans, and making health care
more affordable for all americans."
"i told you we would unleash american innovation and technology to
tackle the health challenges of our time."
"it's an opportunity to save lives, and an opportunity we just can't
miss."
"first, it will make real investments this year to combat the heroin
and prescription drug epidemic that's plaguing so many of our
communities."
Answers
"over the last eight years, we've delivered on that promise in many ways, both big and small, including, of course, providing health coverage to 20 million more Americans and making healthcare more affordable for all Americans."
Which quotation addresses the audience concern that President Obama should not take anymore actions at the end of his term while waiting for President Trump to take office?The quotation that addresses the audience's concern about President Obama taking actions at the end of his term while waiting for President Trump to take office is:
"over the last eight years, we've delivered on that promise in many ways, both big and small, including, of course, providing health coverage to 20 million more Americans and making healthcare more affordable for all Americans."
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A Carnot refrigeration cycle is used to maintain a room at
23 °C by removing heat from groundwater at 15 °C.
Refrigerant R-134a enters the condenser as saturated
vapor at 40 °C and leaves as saturated liquid at the
same temperature. The evaporator pressure is 351 kPa.
a) If the room is to receive 2kW, what is power input to
the compressor?
b) Net power input to cycle?
Answers
a) The power input to the compressor in the Carnot refrigeration cycle, in order to supply 2 kW of cooling to the room, will depend on the efficiency of the cycle and the heat transfer involved.
b) The net power input to the cycle can be determined by considering the work done by the compressor and the work done on the system.
a) To calculate the power input to the compressor, we need to determine the heat transfer from the groundwater to the room. The Carnot refrigeration cycle is an idealized cycle, and its efficiency is given by the equation: Efficiency = 1 - (T_evaporator / T_condenser), where T_evaporator and T_condenser are the temperatures at the evaporator and condenser, respectively. Using this efficiency, we can calculate the heat transfer from the groundwater and convert it to power input.
b) The net power input to the cycle takes into account the work done by the compressor and the work done on the system. It can be calculated by subtracting the work done by the compressor from the heat transfer from the groundwater. The work done by the compressor can be determined using the power input calculated in part a), and the heat transfer from the groundwater can be obtained using the given temperatures and the specific heat properties of the refrigerant.
Overall, the Carnot refrigeration cycle involves several calculations to determine the power input to the compressor and the net power input to the cycle, considering the heat transfer and work done in the system.
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